Chime School

Posts Tagged ‘Vision’

Sunglasses are very popular by all ages, even the best fashion brands have their own sunglasses colletions… What are the prescription sunglasses?
Although very often we tend to consider eyewear as a form of decoration, sunglasses are first and foremost a protection of the delicate eye system from the impact of the ultraviolets. Special vision problems prevent lots of people from being able to wear sunglasses, which makes them even more exposed to various other eye health problems. This is the case with anyone who suffers from myopia, astigmatism or hyperopia. The solution for such cases is to be found in prescription sunglasses designed to match exactly the same features of the regular glasses but with ultraviolet protection. The UVB rays cause sunburn while the UVA rays get absorbed by the human eye lens.

Dark lens design and prescription lens structure represent a medical solution to create a product of sun protection eyewear type. Prescription sunglasses use different types of lenses, and here we can count polarized lenses, anti-reflective lenses, blue blockers, photochromic lenses and gradient lenses. It is important to mention here, before going on with the description of prescription sunglasses, that you can only order this kind of eyewear based on an ophthalmologist’s recommendation and after careful medical examination. Total protection against the UVAs and the UVBs should be covered at optimal parameters, due to the fact that people with eye surgery should not be exposed to powerful radiation.

Some prescription sunglasses rely on a wraparound design that prevents the UV rays from entering from the sides. Here, the choice of the frame is everything because it should be large enough to allow for such protection. As for the anti-reflective properties, all quality sunglasses should incorporated the polarized coating for a superior protection of the eyes. The amount of light that enters the eyes could also be limited by using mirror-coated lenses. The stage of the eye condition will also have an influence on the design of the prescription sunglasses.

For instance, people who suffer from advanced myopia may require very thick lenses, which could be incompatible with most of the frames. The presence of two or more health problems at the same time could also become an obstacle for the design of prescription sunglasses. Solutions may be available, but only a specialist will be able to tell you which is the best for you. Moreover, price awareness is another important element given the fact that prescription sunglasses will always be more expensive, as the number of specialists who can design them is smaller too.

Quantifying your pupillary distance:

This measurement is the distance between the centre of your pupils that is measured in millimetres.

Opticians do not tend to give out this measurement as it encourages patients to buy their spectacles from them whereas you can buy cheap spectacles online or designer glasses at a fraction of the price online. It is commonly noted as one measurement like 60 (60mm) but could also be registered as R 29 L 31. When written in this way it is the individual distance from your right and left pupils to the center of your nose.

When Varifocals, High Prescriptions or Prisms are ordered the measurement is usually split individually. On the whole, if you have a single vision prescription, it will be written down as one value.

If you do not know this measurement and don’t want to measure it yourself then most online opticians will make your PD the national average (63) for men and (60) for women.

You could ask a friend or family member to calculate your pupillary distance for you:

This is the easiest method for measuring you PD. To do this, ask a friend to sit opposite you and place a ruler against your forehead so that they can read off the markings from the ruler.

Next ask your friend to close their right eye and you then look directly into their left eye. Request your assistant to slide the ruler in order for the zero value is in the center of your right pupil and to hold the ruler very steady across your brow. Then ask your friend to close their left eye and for you to look directly into their right eye.

Your acquaintance will then read off the measurement to the centre of your left pupil. And that is it! It really is that easy! Please see the diagram below to help you further.

Using your present-day eyeglasses to evaluate you pupillary distance with assistance from a friend:

Make sure that your glasses fit nicely by wearing them and seeing how they feel. Request your colleague to stand opposite you and check on your lenses the position of your pupils with a non permanent marker.

You should now see two lines directly infront of you whilst wearing your specs. Merely, remove your sunglasses and measure the distance between the two markings. And that’s it! If the ruler shows 6 cm then your pupillary distance will be termed as 60. If the measurement is 6.3cm then your pupillary distance will be 63.

If you have a varifocal measurement, then just measure across from your right eye to the centre of your nose and then again from the centre of your nose to your left eye and record the individual readings for both your left and right eyes. If you’re not in the market for buying sunglasses with prescription lenses in then don’t worry about what’s in this article.

The term Lasik in Lasik Eye Surgery, a type of refractive eye surgical procedure, stands for “laser-assisted in situ keratomileusis,” This surgery is performed by ophthalmologists in order to remedy eye illnesses such as myopia, astigmatism and hyperopia. The corneal flap is remedied using laser technology in order to form the cornea or the transparent casing of the eye. A highly specialized laser is used in improving the vision of the patient, eliminating the use of glasses or contact lenses. Refractive errors are also cured using Lasik eye medication. Despite the use of expensive equipment, lasik surgery cost is quite reasonable.

Lasik Eye Surgery is employed in order to treat various eye illnesses such as myopia or nearsightedness, hyperopia or farsightedness and astigmatism. The inequity in eye length and concentrating power causing nearer things to become clearer than far-away objects are healed in myopia eye medication. In hyperopia, the disparity involving the focusing power and the eye length that cause distant objects to become clearer than nearer objects are treated. In astigmatism, the distorted cornea causing multiple images on the patient’s retina is remedied. The cost of lasik eye surgery is affordable enough that many people choose this option over contact lenses or glasses to correct these illnesses.

There are three steps in performing a Lasik Eye Surgery. A thin hinged corneal flap is made by the eye surgeon with the use of lasers. The patient’s eye is then detained in its place by means of a corneal suction ring. An explicit type of laser called “femtosecond laser microkeratome” is then employed in order to make the flap. A series of closely arranged bubbles are then created within the patient’s cornea. The flap is then folded back in order to reveal the stroma or the middle section of the cornea.

The second step is using the laser to reshape the patient’s cornea in a distinctive manner. “Excimer Laser” is the laser that will be utilized in this step. The stroma is not harmed during the period the laser vaporizes the eye tissues in a sensitive manner. Tens of micrometers of tissue are detached without any actual burning or cutting involved. Continuous incidents of unclear vision and disorientation may be encountered by the patient during this stage.

There are no stitches necessary when putting back the corneal flap into the cornea after the reshaping process. The eye surgeon carefully replaces the flap over the treated area of the cornea. Air bubbles and other debris that may have paved its way unto the eye are verified and removed by the eye specialist. The flap will heal itself naturally by attaching itself to the cornea. A few weeks up to a couple of months are typically the time required.

There are several things the patient must do after lasik eye surgery. Various antibiotics and anti-inflammatory eye drops are given to the patient for the first few weeks after the eye treatment. Prescription drops and preservative-free tears are then utilized in order to moisturize the eyes. The patient also needs much sleep in order to speed up the recovery process. Dark-shaded sunglasses are also a must in order to protect the eyes from bright lights. Protective goggles are also required to prevent the rubbing of the eyes which may deal damage to the eyes when sleeping.